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A persistent and immutable analogue of the Java Collections API.
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All of the provided implementations are thread-safe (although their
iterators may not be) but this is not required by the interfaces.
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The classes and interfaces in this package are related as follows.
Note the importance of IntTreePMap, which provides the backing for every
provided implementation except ConsPStack:
<img src="doc-files/pcollections.svg"/>
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